问我用堆栈封装的3个容器来得到类似这样的布局，现在我想让页面可以滚动吗？

EN

 Widget build(BuildContext context) {
final article args = ModalRoute.of(context).settings.arguments;
return new LayoutBuilder(
    builder: (BuildContext context, BoxConstraints viewportConstraints) {
  return SingleChildScrollView(
      child: ConstrainedBox(
          constraints: BoxConstraints(
            minHeight: viewportConstraints.minHeight,
          ),
          child: Stack(
            children: <Widget>[
              Container(
                color: Colors.green,
              ),
              Container(
                height: 300.0,
                decoration: BoxDecoration(
                    image: DecorationImage(
                  image: AssetImage("images/image.jpg"),
                  fit: BoxFit.cover,
                )),
              ),
              Positioned(
                  left: 40.0,
                  right: 40.0,
                  top: 240.0,
                  bottom: 40.0,
                  child: Container(
                    height: 500.0,
                    width: 300.0,
                    decoration: BoxDecoration(
                      borderRadius: BorderRadius.circular(10.0),
                      color: Colors.pink,
                    ),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.center,
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: <Widget>[
                        Container(
                          child: Text(
                            "Title",
                            style: TextStyle(
                              fontSize: 20.0,
                              fontFamily: 'Roboto',
                              color: Colors.black,
                            ),
                          ),
                        ),
                        SizedBox(height: 100),
                        Text(
                          "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.",
                          style: TextStyle(
                              fontSize: 20.0, color: Colors.black),
                        )
                      ],
                    ),
                  )),
            ],
          )));
});

I/flutter ( 8759): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY

 ╞═════════════════════════════════════════════════════════
I/flutter ( 8759): The following message was thrown during layout:

I/flutter ( 8759): A RenderFlex overflowed by 134 pixels on the bottom.

I/flutter ( 8759): 

I/flutter ( 8759): The overflowing RenderFlex has an orientation of 
Axis.vertical.